Example usage for java.util.stream Stream empty

Introduction

In this page you can find the example usage for java.util.stream Stream empty.

Prototype

public static <T> Stream<T> empty()

Source Link

Document

Returns an empty sequential Stream .

Usage

From source file:com.yahoo.bard.webservice.util.SimplifiedIntervalList.java

/**
 * Takes one or more lists of intervals, and combines them into a single, sorted list with the minimum number of
 * intervals needed to capture exactly the same instants as the original intervals.
 * <p>//from ww  w . j  av a  2 s  . co m
 * If any subintervals of the input collection abut or overlap they will be replaced with a single, combined
 * interval.
 * <p>
 * Examples:
 * <ul>
 * <li>['2014/2017', '2015/2020'] will combine into ['2014/2020']
 * <li>['2015/2016', '2016/2017'] will combine into ['2015/2017]
 * <li>['2015/2016', '2013/2014'] will sort into ['2013/2014', '2015/2016']
 * <li>['2015/2015', '2015/2016', '2012/2013'] will sort and combine to ['2012/2013', '2015/2016']
 * </ul>
 * @param intervals  The collection(s) of intervals being collated
 *
 * @return A single list of sorted intervals simplified to the smallest number of intervals able to describe the
 * duration
 */
@SafeVarargs
public static SimplifiedIntervalList simplifyIntervals(Collection<Interval>... intervals) {
    Stream<Interval> allIntervals = Stream.empty();
    for (Collection<Interval> intervalCollection : intervals) {
        allIntervals = Stream.concat(allIntervals, intervalCollection.stream());
    }

    return allIntervals.sorted(IntervalStartComparator.INSTANCE::compare).collect(getCollector());
}

From source file:com.github.pjungermann.config.specification.DefaultConfigSpecificationLoaderTest.java

@Test
public void load_nonRecursiveAndEmptyStream_emptySpecification() {
    ConfigSpecification specification = loader.load(false, Stream.empty());

    assertSame(converter, specification.typeConverter);
    assertTrue(specification.constraints.isEmpty());
    assertTrue(specification.errors.isEmpty());
}

From source file:com.ggvaidya.scinames.ui.DatasetImporterController.java

public Stream<Dataset> getImportedDatasets() {
    if (currentDataset == null)
        return Stream.empty();

    return Stream.of(currentDataset);
}

From source file:org.trustedanalytics.cloud.cc.api.customizations.FeignErrorDecoderHandler.java

private Stream<String> decodeExpectedFields(Response response) {
    String body = EMPTY_STRING;/*from w  w  w  .jav a2s .  c  om*/
    try {
        body = IOUtils.toString(response.body().asInputStream(), Charsets.UTF_8.toString());
        JsonNode json = MAPPER.readValue(body, JsonNode.class);
        return fieldPaths.stream().map(json::path).filter(JsonNode::isValueNode).map(JsonNode::asText);
    } catch (Exception e) {
        LOGGER.info("Unable to deserialize response: {}", body);
        return Stream.empty();
    }
}

From source file:org.zaproxy.VerifyScripts.java

private static Stream<Arguments> scriptsRuby() {
    if (!SystemUtils.IS_JAVA_1_8) {
        // Ref: https://github.com/zaproxy/zaproxy/issues/3944
        return Stream.empty();
    }//  w ww  .  j  ava  2  s  . com
    return testData(".rb", (Compilable) new JRubyEngineFactory().getScriptEngine());
}

From source file:com.github.pjungermann.config.specification.DefaultConfigSpecificationLoaderTest.java

@Test
public void load_recursiveAndEmptyStream_emptySpecification() {
    ConfigSpecification specification = loader.load(true, Stream.empty());

    assertSame(converter, specification.typeConverter);
    assertTrue(specification.constraints.isEmpty());
    assertTrue(specification.errors.isEmpty());
}

From source file:acmi.l2.clientmod.l2resources.Environment.java

public Stream<File> listFiles() {
    return paths.stream().flatMap(s -> {
        File file = new File(startDir, s);
        File parent = file.getParentFile();
        if (!parent.exists())
            return Stream.empty();
        return FileUtils.listFiles(file.getParentFile(), new WildcardFileFilter(file.getName()), null).stream();
    });/*  w  w w  .  j  a  va2s  .  c  om*/
}

From source file:org.zaproxy.VerifyScripts.java

private static Stream<Arguments> scriptsZest() {
    // Just collect the files for now (Issue 114).
    getFilesWithExtension(".zst");
    return Stream.empty();
}

From source file:org.apache.james.webadmin.service.MailRepositoryStoreServiceTest.java

@Test
public void listMailRepositoriesShouldReturnEmptyWhenEmpty() {
    when(mailRepositoryStore.getPaths()).thenReturn(Stream.empty());

    assertThat(testee.listMailRepositories()).isEmpty();
}

From source file:com.spotify.heroic.shell.task.DeleteKeys.java

@Override
public AsyncFuture<Void> run(final ShellIO io, final TaskParameters base) throws Exception {
    final Parameters params = (Parameters) base;

    final MetricBackendGroup group = metrics.useOptionalGroup(params.group);

    final QueryOptions options = QueryOptions.builder().tracing(Tracing.fromBoolean(params.tracing)).build();

    Stream<BackendKey> keys = Stream.empty();

    keys = Stream.concat(keys, Tasks.parseJsonLines(mapper, params.file, io, BackendKeyArgument.class)
            .map(BackendKeyArgument::toBackendKey));

    final ImmutableList.Builder<BackendKey> arguments = ImmutableList.builder();

    for (final String k : params.keys) {
        arguments.add(mapper.readValue(k, BackendKeyArgument.class).toBackendKey());
    }//  ww  w . j  a v  a  2s .  c  om

    keys = Stream.concat(keys, arguments.build().stream());

    if (!params.ok) {
        return askForOk(io, keys);
    }

    return doDelete(io, params, group, options, keys);
}